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24 October, 19:09

If Y varies directly as X and Y = 79 when X = 49, Find Y if X = 9

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  1. 24 October, 20:26
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    y = 14.5

    Step-by-step explanation:

    given that y varies directly as x

    mathematically,

    y ∝ x

    y = kx ... where k is the constant of proportionality.

    k = y / x

    given that

    y = 79

    x = 49

    k = 79/49

    k = 1.61

    to find y when x = 9

    from

    y = kx

    y = 1.61 * 9

    y = 14.5

    therefore the value of y when x = 9 in ths variation is evaluated to be equals to 14.5
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